Implementation of robust statistics in the calibration, verification and validation step of model evaluation to better reflect processes concerning total phosphorus load occurring in the catchment

Ostojski, Mieczysław S.; Gębala, Joanna; Orlińska-Woźniak, Paulina; Wilk, Paweł

doi:10.1016/j.ecolmodel.2016.04.004

Cited by 20 publications

(13 citation statements)

References 14 publications

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“…The results are presented in Table 5. An assessment of the modelling conducted using robust statistics and winsorized L estimators were used (Ostojski et al, 2016). In the case of calibration, verification and validation of flow, all statistical measures obtained "very good" or "good" (Alansi et al, 2009;Chiang et al, 2012;Krause, 2005;Moriasi et al, 2007) results of model fit.…”

Section: The Modelling Resultsmentioning

confidence: 99%

“…It was recognized that such a calibration method enables the fitting of the appropriate model to real conditions, especially for general phosphorus, for which automatic calibration is problematic due to the small amount of observational data. To evaluate model matching with observation in subsequent iterations of the loop, three statistical measures, R2 (coefficient of determination), percent bias (PBIAS) and the Nash-Sutcliffe efficiency (NSE), were used (Moriasi and Arnold, 2007;Ostojski et al, 2016).…”

Section: Sensitivity Analysis and Calibrationmentioning

confidence: 99%

“…In a revised version of the article, we will describe the data so that it is clear to every reader why this time period has been used. For each of these processes, robust statistics were used to calculate the winsorized robust statistical measures (Ostojski et al, 2016).…”

Section: Sensitivity Analysis and Calibrationmentioning

confidence: 99%

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The river absorption capacity determination as a tool to evaluate state of surface water

Wilk

Orlińska-Woźniak

Gębala

2018

Hydrol. Earth Syst. Sci.

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Abstract. In order to complete a thorough and systematic assessment of water quality, it is useful to measure the absorption capacity of a river. Absorption capacity is understood as a pollution load introduced into river water that will not cause permanent and irreversible changes in the aquatic ecosystem and will not cause a change in the classification of water quality in the river profile. In order to implement the method, the Macromodel DNS/SWAT basin for the Middle Warta pilot (central Poland) was used to simulate nutrient loads. This enabled detailed analysis of water quality in each water body and the assessment of the size of the absorption capacity parameter, which allows the determination of how much pollution can be added to the river without compromising its quality class. Positive values of the calculated absorption capacity parameter mean that it is assumed that the ecosystem is adjusted in such a way that it can eliminate pollution loads through a number of self-purification processes. Negative values indicate that the load limit has been exceeded, and too much pollution has been introduced into the ecosystem for it to be able to deal with through the processes of self-purification. Absorption capacity thus enables the connection of environmental standards of water quality and water quality management plans in order to meet these standards.

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Section: The Modelling Resultsmentioning

confidence: 99%

Section: Sensitivity Analysis and Calibrationmentioning

confidence: 99%

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The river absorption capacity determination as a tool to evaluate state of surface water

Wilk

Orlińska-Woźniak

Gębala

2018

Hydrol. Earth Syst. Sci.

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“…It was built and then calibrated to verify and validate the mathematical model [20]. Properly calibrated, verified and validated models have prognostic capabilities that allow mapping of the behavior of the actual ecosystem.…”

Section: Sensitivity Analysismentioning

confidence: 99%

Mathematical description of a river absorption capacity on the example of the middle Warta catchment

Wilk¹,

Orlińska-Woźniak²,

Gębala³

2018

Environ. Protect. Eng.

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The paper presents a mathematical description of a module to determine the river absorption capacity (RAC), which is an extension of the Macromodel DNS/SWAT developed in IMGW-PIB. The balance equations of pollution loads are presented, as well as the mathematical description of the retention of pollutants, taking into account concentrations and loads of pollutants in selected river profiles. The developed mathematical module mRAC was tested in the Warta catchment between river calculation profiles Nowa Wieś Podgórna and Oborniki for total nitrogen (TN) and total phosphorus (TP).

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“…The following 5 statistical estimators were used to evaluate the accuracy of the calibrated and validated results suggested by the previous studies [55][56][57][58][59][60].…”

Section: Model Accuracy Evlauationmentioning

confidence: 99%

Modeling Approach for Water-Quality Management to Control Pollution Concentration: A Case Study of Ravi River, Punjab, Pakistan

Iqbal

Shoaib

Agwanda

et al. 2018

Water

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Abstract:One of the challenging problems of Punjab, the most populous province of Pakistan, is the surface water-quality problem of the Ravi River, which flows through the main cities of the province. At present, the overall status of water quality is very polluted, primarily due to residential and industrial wastewater directly discharged into the Ravi River through a network of drains. Due to the poor quality of the water, the river ecosystem is not favorable for the aquatic and surrounding environment. Hence, management options are proposed to reduce pollution. Therefore, the study was formulated to identify the main sources of pollution along the Ravi River and their potential impact on the course of the river channel. In addition, the study applied a numerical model WASP 8.1 (Water Quality Simulation Program) to discover the best strategy for the improvement of water quality. Through the model simulation it was found that, if the flow at headwater and link canals is increased up to 50%, along with 75% improvement in the pollution concentration of drains through wastewater-treatment facilities, the water quality of the Ravi River can be improved up to an acceptable limit of water-quality standards.

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Implementation of robust statistics in the calibration, verification and validation step of model evaluation to better reflect processes concerning total phosphorus load occurring in the catchment

Cited by 20 publications

References 14 publications

The river absorption capacity determination as a tool to evaluate state of surface water

The river absorption capacity determination as a tool to evaluate state of surface water

Mathematical description of a river absorption capacity on the example of the middle Warta catchment

Modeling Approach for Water-Quality Management to Control Pollution Concentration: A Case Study of Ravi River, Punjab, Pakistan

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